h1 {
    text-align: center;
    font: bolder;
    border-collapse:  1px solid black;
}
.noidung{
    color: black;
    font: bold;
    text-align: left;
 }
 h1, h3, .tieude{
    border: black;
    color: #069;
    font-size: larger;
    text-align: center;
    font: bolder;
    font-family:  inherit;
}
.lichsu{
    color: red;
    background: #3278b3;
    border: 1px solid black;
    text-align: center;
}
h1, .dangnhap{
    color: red;
    font: bolder;
    size: letter;
}